AstraZeneca (AZN), Pfizer (PFE) and Novartis (NVS) are among the suitors preparing bids for Onyx Pharmaceuticals (ONXX), Bloomberg reports, citing two people familiar with the matter. First round bids may come this week, while Amgen (AMGN) remains interested in bidding and is waiting to hear from Onyx about resuming talks, the report adds. Shares of Onyx are up 3% to $130.11 following Bloomberg's story.